math
200

hours can run 40 mile in hour 

how much mile he run in 30 min


20 per 30 minuete

400

4x4

16

400

I had 4 bananas and 10 apples and I ate 4apples


how many fruit are left

10 is the answer

800

100x 1000

100000

1000

9x90

810

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